The 2.7 A crystal structure of deoxygenated hemoglobin from the sea lamprey (Petromyzon marinus): structural basis for a lowered oxygen affinity and Bohr effect.
Heaslet HA, Royer WE. The 2.7 A crystal structure of deoxygenated hemoglobin from the sea lamprey (Petromyzon marinus): structural basis for a lowered oxygen affinity and Bohr effect. Structure. 1999 May; 7(5):517-26.